The Tor Browser: dom/speakermanager/SpeakerManagerServiceChild.cpp@97036ab72558

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

     1 /* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */

     2 /* vim: set ts=2 et sw=2 tw=80: */

     3 /* This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this file,

     5  * You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #include "SpeakerManagerServiceChild.h"

     8 #include "mozilla/Services.h"

     9 #include "mozilla/StaticPtr.h"

    10 #include "mozilla/unused.h"

    11 #include "mozilla/dom/ContentChild.h"

    12 #include "mozilla/dom/ContentParent.h"

    13 #include "nsIObserverService.h"

    14 #include "nsThreadUtils.h"

    15 #include "AudioChannelService.h"

    16 #include <cutils/properties.h>

    18 using namespace mozilla;

    19 using namespace mozilla::dom;

    21 StaticRefPtr<SpeakerManagerServiceChild> gSpeakerManagerServiceChild;

    23 // static

    24 SpeakerManagerService*

    25 SpeakerManagerServiceChild::GetSpeakerManagerService()

    26 {

    27   MOZ_ASSERT(NS_IsMainThread());

    29   // If we already exist, exit early

    30   if (gSpeakerManagerServiceChild) {

    31     return gSpeakerManagerServiceChild;

    32   }

    34   // Create new instance, register, return

    35   nsRefPtr<SpeakerManagerServiceChild> service = new SpeakerManagerServiceChild();

    36   NS_ENSURE_TRUE(service, nullptr);

    38   gSpeakerManagerServiceChild = service;

    39   return gSpeakerManagerServiceChild;

    40 }

    42 void

    43 SpeakerManagerServiceChild::ForceSpeaker(bool aEnable, bool aVisible)

    44 {

    45   mVisible = aVisible;

    46   mOrgSpeakerStatus = aEnable;

    47   ContentChild *cc = ContentChild::GetSingleton();

    48   if (cc) {

    49     cc->SendSpeakerManagerForceSpeaker(aEnable && aVisible);

    50   }

    51 }

    53 bool

    54 SpeakerManagerServiceChild::GetSpeakerStatus()

    55 {

    56   ContentChild *cc = ContentChild::GetSingleton();

    57   bool status = false;

    58   if (cc) {

    59     cc->SendSpeakerManagerGetSpeakerStatus(&status);

    60   }

    61   char propQemu[PROPERTY_VALUE_MAX];

    62   property_get("ro.kernel.qemu", propQemu, "");

    63   if (!strncmp(propQemu, "1", 1)) {

    64     return mOrgSpeakerStatus;

    65   }

    66   return status;

    67 }

    69 void

    70 SpeakerManagerServiceChild::Shutdown()

    71 {

    72   if (gSpeakerManagerServiceChild) {

    73     gSpeakerManagerServiceChild = nullptr;

    74   }

    75 }

    77 void

    78 SpeakerManagerServiceChild::SetAudioChannelActive(bool aIsActive)

    79 {

    80   // Content process and switch to background with no audio and speaker forced.

    81   // Then disable speaker

    82   for (uint32_t i = 0; i < mRegisteredSpeakerManagers.Length(); i++) {

    83     mRegisteredSpeakerManagers[i]->SetAudioChannelActive(aIsActive);

    84   }

    85 }

    87 SpeakerManagerServiceChild::SpeakerManagerServiceChild()

    88 {

    89   MOZ_ASSERT(NS_IsMainThread());

    90   AudioChannelService* audioChannelService = AudioChannelService::GetAudioChannelService();

    91   if (audioChannelService) {

    92     audioChannelService->RegisterSpeakerManager(this);

    93   }

    94   MOZ_COUNT_CTOR(SpeakerManagerServiceChild);

    95 }

    97 SpeakerManagerServiceChild::~SpeakerManagerServiceChild()

    98 {

    99   AudioChannelService* audioChannelService = AudioChannelService::GetAudioChannelService();

   100   if (audioChannelService) {

   101     audioChannelService->UnregisterSpeakerManager(this);

   102   }

   103   MOZ_COUNT_DTOR(SpeakerManagerServiceChild);

   104 }

   106 void

   107 SpeakerManagerServiceChild::Notify()

   108 {

   109   for (uint32_t i = 0; i < mRegisteredSpeakerManagers.Length(); i++) {

   110     mRegisteredSpeakerManagers[i]->DispatchSimpleEvent(NS_LITERAL_STRING("speakerforcedchange"));

   111   }

   112 }

The Tor Browser / file revision

dom/speakermanager/SpeakerManagerServiceChild.cpp@97036ab72558

dom/speakermanager/SpeakerManagerServiceChild.cpp